Kapitel/Beitrag aus dem Buch: Längle, T et al. 2015. OCM 2015 – 2nd International Conference on Optical Characterization of Materials, March 18th – 19th, 2015, Karlsruhe, Germany : Conference Proceedings.
Visible (VIS) and ShortWavelength Infrared (SWIR) Reflectance
Spectroscopy are used to determine the presence of iron
impurities on calcined kaolin. For industrial applications, primary
kaolin is calcined by roasting at temperatures of greater
than 1100 °C. The presence of iron impurities in the primary
kaolin affects the optical properties of the processed calcined clay.
Spectral analysis in the VIS and SWIR ranges allows the analysis
of iron phases in kaolin. In the kaolin calcination sequence, features
in the VIS range change as a consequence of the variations
in iron oxidation. Some of these variations are related to iron released
in the breakdown of the kaolinite crystal lattice, which is
identified by the changes in the SWIR features. The spectral characterization
of the calcination of kaolin contributes to the understanding
of these processes. Its application would enable more
precise control of calcined kaolin properties and help to optimise
the calcination process.
Guatame-Garcia A. & Buxton M. 2015. Visible and infrared reflectance spectroscopyfor characterization of iron impurities incalcined kaolin clays. In: Längle, T et al (eds.), OCM 2015 – 2nd International Conference on Optical Characterization of Materials, March 18th – 19th, 2015, Karlsruhe, Germany : Conference Proceedings. Karlsruhe: KIT Scientific Publishing. DOI: https://doi.org/10.58895/ksp/1000044906-18
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Veröffentlicht am 18. März 2015